Patio stone



FIG. 1 is a perspective view of a patio stone showing my new design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a side elevational thereof. All four sides are the same.

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a cross-sectional view thereof taken along line 5-5 of FIG. 2.

The dashed lines in FIGS. 1-5 represent unclaimed portions of the patio stone or define bounds of the claimed design and form no part of the claimed design. 

The ornamental design for a patio stone, as shown and described. 